Comparative compressibility and equation of state of orthorhombic and tetragonal edingtonite |
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Authors: | Email author" target="_blank">G D?GattaEmail author T Boffa?Ballaran P?Comodi P F?Zanazzi |
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Institution: | (1) Bayerisches Geoinstitut, Universität Bayreuth, Universität Str. 30, 95447 Bayreuth, Germany;(2) Dipartimento di Scienze della Terra, Università di Perugia, Piazza Università 1, 06100 Perugia, Italy |
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Abstract: | The high-pressure (HP) behaviour of a natural orthorhombic and tetragonal edingtonite from Ice River, Canada, has been investigated using in situ single-crystal X-ray diffraction. The two isothermal equations of state up to 6.74(5) GPa were determined. V0, KT0 and K refined with a third-order Birch–Murnaghan equation of state (BM-EoS) are: V0 = 598.70(7) Å3, KT0 = 59(1) GPa and K =3.9(4) for orthorhombic edingtonite and V0 = 600.9(2) Å3, KT0 = 59(1) GPa and K =4.2(5) for tetragonal edingtonite. The experiments were conducted with nominally hydrous pressure penetrating transmitting medium. No overhydration effect was observed within the pressure range investigated. At high-pressures the main deformation mechanism is represented by cooperative rotation of the secondary building unit (SBU).Si/Al distribution slightly influences the elastic behaviour of the tetrahedral framework: the SBU bulk moduli are 125(8) GPa and 111(4) GPa for orthorhombic and tetragonal edingtonite, respectively. Extra-framework contents of both zeolites show an interesting behaviour under HP conditions: the split Ba2 site at P >2.85 GPa is completely empty; only the position Ba1 is occupied. Electronic Supplementary Material. Supplementary material to this paper (Observed and calculated structure factors) is available in electronic form at Electronic Supplementary Material Supplementary material is available in the online version of this article at |
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Keywords: | Orthorhombic and tetragonal edingtonite High-pressure single-crystal X-ray diffraction Comparative compressibility |
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